1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
myrzilka [38]
3 years ago
7

How old is the earth? How do we know?

Geography
1 answer:
elena-s [515]3 years ago
8 0
4.54 billion years<span>The "best" age for the Earth is based on the time required for the lead isotopes in four very old lead ores (galena) to have evolved from the composition of lead at the time the Solar System formed, as recorded in the Canyon Diablo iron meteorite. This "model lead age" is <span>4.54 billion years</span></span>
You might be interested in
The distance from Alexandria to Syene is about 500 miles. On the summer solstice the sun is directly overhead at noon in Syene.
svp [43]

Answer:

Earth circumference is 25000 miles

correct option is 25,000 miles

Explanation:

we have given here Alexandria to Syene distance = 500 miles

the sun is 1/50th of the circumference of the sky (about 7°)

as we know that Earth circumference done by astronomer Eratosthenes in 240 B.C

He observe on a particular time of day ( in noon) during the summer solstice

and there was no shadow in Syene in Egypt so  This was verified that the sun must be directly on overhead and not at an angle to the surface of the city at that time

so

In Alexandria he measured the position of sun at the same time and found it to be nearly (1/50)th of a complete circle

it would be 7.2 degree (when we do \frac{360}{50} = 7.2)

so 2 reference points being 2 cities for the sun

all measure circumference =  the distance between these two cities × 50  

and we have given 500 miles

so

Earth circumference = 500 × 50

Earth circumference is 25000 miles

correct option is 25,000 miles

4 0
3 years ago
Homework 3.03 coastal process odd one out​
Scorpion4ik [409]

Answer:

homework 3.03 coastal process odd one out?

what is this please provide complete question man

4 0
3 years ago
What did Europe want from Africa? *
vodomira [7]

Answer:

C. Europe wanted Africa's valuable resources

Explanation:

During this time, many European countries expanded their empires by aggressively establishing colonies in Africa so that they could exploit and export Africa's resources. Raw materials like rubber, timber, diamonds, and gold were found in Africa. Europeans also wanted to protect trade routes.

4 0
2 years ago
Where did the Yom Kippur War of the<br> 1970s take place?
galina1969 [7]

Answer:

Combatants: Israel, Egypt, Syria

End date: 25 October 1973

Date: 6

Explanation:

4 0
2 years ago
Analyze the map below and answer the question that follows.
Andrej [43]
C is your answer to your question
5 0
2 years ago
Read 2 more answers
Other questions:
  • Which country is labeled with the letter "C"? A: Mexico B:Guatemala C:Panama D:Dominican Republic
    12·1 answer
  • 6. What geographic reason explains why Russia would not have many usable harbors on
    7·1 answer
  • What are the disadvantages of wind power
    12·2 answers
  • In which of the following areas was wheat most probably domesticated earliest? Southern Italy A Northern Libya B The plateau of
    9·1 answer
  • !!!!!!!!!Help please........
    7·1 answer
  • What geological features cause oil and natural gas to be trapped in the rock?
    5·1 answer
  • Analyze the photo above. Which of the Earth’s biomes is home to evergreen trees that adapt to survive cold, dry winters?
    8·2 answers
  • Which is bigger 150 million kilometers or 4.5 light years?
    12·1 answer
  • Explain how the quality of someone's life can be measured socially, economically, and environmentall.
    9·1 answer
  • Closely spaced isobars indicate ________.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!